Chevrolet Bel Air HVAC Temperature Control Bulb Bulb Size

The Chevrolet Bel Air HVAC temperature control bulb utilizes a 53 bulb size for illumination within the dashboard assembly. Data for the specific component covers the range from 1955 to 1963.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Type	Shop
1955-1963	53	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	53	Check Price

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Additional Notes

The ANSI 53 bulb is the sole bulb type specified for the HVAC temperature control in the Chevrolet Bel Air across all listed model years, 1955-1963.
The 53 bulb operates on a 12-volt electrical system and draws 2 watts, placing it in the low-wattage range typical of instrument and control panel illumination applications.
This bulb uses a BA9s base, a miniature bayonet fitting with a 9mm cap width, which is a common format for small indicator and panel lighting.
The 53 bulb is a single-filament type, meaning it produces one fixed level of illumination with no high or low beam function.
The ANSI 53 designation confirms the bulb meets a standardized specification recognized in both the United States and Canada, establishing consistent physical and electrical parameters across manufacturers.
The BA9s base type is not universally interchangeable with other miniature bayonet bases, and substitutions using physically similar but differently rated bulbs risk mismatched voltage or wattage for this application.